All mediums and aggregates are local: Although various norming standards for mediums have been defined (ASTM, US DOT, DIN, ANSI, etc.), those norm/standards are only rough averages: they are specific definitions of terms used in contract specifications sheets, architectural or engineering detail sheets, geotechnical designs, and so forth.

Real life stone, gravel and sand densities (weight / volume) vary widely: The local quarry or supplier which you elect to use should be able to provide the densities (tons / cubic yard) of their unique gravel, which they are quoting to you.

The densities of local mediums (gravels, crushed stone, aggregates, sands, etc) will vary from one quarry to the next.

The densities (pounds per square foot, or tons per cubic yard, sometimes called "pounds per foot" or "tons per cube") will also vary according to the season, the saturation levels (dampness) of the piles of medium when you purchase the mediums, the quality of the sieves used to sort the crusher runs, and so forth.

To use the below chart in calculating how many tons your job requires:

Determine what type of local gravel or medium you will be using.

To convert tonnages into volumes (from tons to cubes) of gravel, sand, or other mediums into cubic yards ("cubes" or yd.³ per ):

Find the best description of the medium you are using - in the first column.

Copy the factor in the column titled "yards/ton" - a seven-decimal number in BLUE.

Multiply:

(your tonnage) x (yards/ton) = your cubic yards

(your metric tonnage) x (m³/tonne) = your cubic meters

To convert volumes into tonnages (from cubic yards into tons) of gravel, sand or other typical mediums into tons ("tons" or "Short Tons" - avdp):

Find the best description of the medium you are using - in the first column.

Copy the factor in the column titled "tons/yard" - a four-decimal number in RED.

In some areas a very immature form of Limestone deposits is called "Caliche."

The below densities are based upon the average-median; or "a typical limestone which one might expect to find in many areas across the USA."

Definition of "limestone": n. A colorless or white crystalline compound, CaCO3, occurring naturally as chalk,limestone, marble, Caliche, and other forms; "Limestone" is also used in a wide variety of manufactured products including commercial chalk, medicines, and dentifrices.

Limestone, solid

2.61

163

2.2005

0.4544422

Limestone, broken

1.55

97

1.3095

0.7636502

Limestone, pulverized

1.39

87

1.1745

0.8514261

* Caliche (immature limestone)

1.44

90

1.2150

0.8230453

Mica, solid

2.88

180

2.4300

0.4115226

Mica, broken

1.60

100

1.3500

0.7407407

Quartz, solid

2.64

165

2.2275

0.4489338

Quartz, lump

1.55

97

1.3095

0.7636502

Quartz sand

1.20

75

1.0125

0.9876543

Above: About Quartz, aka "Silica Dioxide" or SiO2...

Silica is the second most common element in the earth, following only oxygen (Silica comprises roughly 35% of the entire earth's mass, by most scientific estimates).

Common Quartz is also the fourth hardest natural mineral in the earth, following only: Diamonds, Sapphires and Topaz.

Because Quartz Sand is nonporous - and because it is an extremely adamant mineral - Quartz will not decay into dust or dissolve and wash away: as will all other typical minerals or sands.

This is why the beaches of the world are almost uniquely Quartz sand: all the other types of sand have long ago decayed into microscopic particles (colloidals) and dissolved away.